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Linear Motion FAQs

This document summarizes the frequently asked questions surrounding support for linear motion applications and will be updated regularly.

Linear Motion FAQs main image.

What’s the repeatability of Vention’s 7th axis and linear axis?

For a belt-driven actuator of 1.5 m, the repeatability is +/- 0.025 mm. For a 1.5m ball-screw actuator, it is approx. +/- 0.015 mm. As another point of comparison, the repeatability for a 12 m-long 7th axis extender is approx. +/- 0.2 mm.

Note that Vention measures repeatability at the system level, as opposed to measuring it on the linear axis alone. For example, we would assemble a 7th axis and set a dial comparator to zero. We would then go through several cycles of acceleration/deceleration and see if the system maintain its “zero” during each cycle.

To maintain the system’s precision over time, some clients simply “re-home” after completing a certain number of cycles.


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